Vampire

Vampires are mythological or folkloric beings who subsist by feeding on the life essence (generally in the form of blood) of living creatures, regardless of whether they are undead or a living person/being.

Psychic vampires

People killed suddenly or by accident may become disembodied psychic vampires. In one of The Mahatma Letters to A. P. Sinnett the Mahatma K.H. wrote:

If sinful and sensual they wander about — (not shells, for their connection with their two higher principles is not quite broken) — until their death-hour comes. Cut off in the full flush of earthly passions which bind them to familiar scenes, they are enticed by the opportunities which mediums afford, to gratify them vicariously. They are the Pisachas, the Incubi, and Succubi of mediaeval times. The demons of thirst, gluttony, lust and avarice, — elementaries of intensified craft, wickedness and cruelty; provoking their victims to horrid crimes, and revelling in their commission! They not only ruin their victims, but these psychic vampires, borne along by the torrent of their hellish impulses, at last, at the fixed close of their natural period of life — they are carried out of the earth's aura into regions where for ages they endure exquisite suffering and end with entire destruction.